Thermos Ultralight Bottle 500 ml - Lightweight 0.5 Liter Stainless Steel Flask With 10 h Heat Retention
Published on 09/21/2026 at 19:36 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Thermos Ultralight Bottle 500 ml steps into the insulated bottle segment as a lightweight 0.5 liter stainless steel flask designed for hot coffee, tea or cold water on the go. In the 500 ml size, retailer specifications cite a height of about 22.1 cm and a weight around 202 g, putting it among the lighter steel bottles in this capacity class. A German retailer listing for the Ultralight Bottle moon rock mat version lists 500 ml capacity, 22.1 cm height, 7.5 cm bottle diameter and 202 g weight for the 500 ml Ultralight Bottle. The double wall vacuum insulation is specified to keep drinks up to 10 hours hot and up to 20 hours cold on this 0.5 liter model. A comparison engine entry for the soft mint matte Ultralight Bottle 500 ml lists 0.5 liter volume with insulation performance of 10 h hot and 20 h cold.
Design, Materials And Capacity
The Ultralight Bottle in the 500 ml size is built around a double wall stainless steel body combined with plastic and silicone components in the lid and seals to create a leakproof and break resistant insulated drink bottle. Retail descriptions specify stainless steel for the main body, polypropylene for parts of the closure and silicone for the gasket, with the construction described as auslaufsicher and bruchfest. One detailed listing notes stainless steel, polypropylene and silicone as the materials and calls the bottle auslaufsicher, bruchfest, doppelwandig, geruchsneutral and geschmacksneutral. Capacity is set at 500 ml, equivalent to 0.5 liter, which aligns with typical personal drink volumes for workday coffee or water. A soft mint matte Ultralight Bottle entry lists a 0.5 liter volume for this model.
Dimension data for the 500 ml Ultralight Bottle typically cite a height of 22.1 cm, a bottle diameter of 7.5 cm and an opening diameter of 4 cm. This footprint keeps the flask slim enough for many backpack side pockets and car cup holders while leaving an opening wide enough for easy filling and cleaning. The same retailer specification lists 500 ml capacity, 22.1 cm height, 4 cm opening diameter and 7.5 cm bottle diameter. The lid uses what Thermos calls a Safe Flow Lid with safety lock, designed so that the drinking opening can be operated with one hand and closed securely during transport. A product description for the Ultralight Bottle 500 ml highlights a doppelwandiger Edelstahl body and a zerlegbares Safe Flow Lid with Safety Lock.
Insulation Performance And Everyday Use
A core technical feature of the Thermos Ultralight Bottle 500 ml is its rated insulation performance of up to 10 hours hot and up to 20 hours cold retention. This performance is achieved through vacuum insulation between the two stainless steel walls, limiting heat transfer between the contents and the outside environment. A specification table for the Ultralight Bottle soft mint 500 ml lists an isoliereffekt warm of 10 h and an isoliereffekt kalt of 20 h. That level of insulation is characteristic for higher grade stainless steel flasks in the half liter class and means prepared hot drinks can stay warm for a full workday, while cold beverages maintain temperature through extended outings.
Weight is a differentiating factor in the Ultralight Bottle line, and for the 500 ml version it is documented around 202 g. Outdoor gear coverage notes Ultralight bottles in several sizes with weights from roughly 165 g up to 275 g, with the 500 ml variant near the middle of that range but still below many comparable steel vacuum flasks in the same volume category. An outdoor magazine overview mentions that the 500 ml Ultralight bottle weighs about 215 g, with the series spanning 165 g to 275 g depending on size. A retailer specification with exact data lists a weight of 202 g for the 500 ml Ultralight Bottle in the moon rock matte color, underlining its positioning as an ultralight option within stainless steel bottles. The Quelle listing for the moon rock mat Ultralight Bottle 500 ml states a weight of 202 g.
Thermos Ultralight Bottle 500 ml Product Details
Thermos presents the Ultralight Bottle 500 ml as a slim stainless steel insulated flask with Safe Flow Lid and long lasting temperature retention for everyday use.
Price Positioning And Comparisons
Price data for the Thermos Ultralight Bottle 500 ml stems mainly from European listings, but it provides a sense of how the bottle is positioned relative to other insulated flasks. A listing for the moon rock matte Ultralight Bottle 500 ml cites a manufacturer recommended retail price of 27.95 EUR and notes a promotional price of 21.77 EUR in that market. An article summarizing the Ultralight Bottle 500 ml notes a 27.95 EUR recommended price and promotional offers around 21.77 EUR for 500 ml models. A detailed product listing for the Ultralight Bottle in a European catalog shows a UVP of 27.95 EUR and a current price of 19.69 EUR for the 500 ml bottle in moon rock mat, reinforcing the placement in the low to mid twenties in its home market. The Quelle listing lists a UVP of 27.95 EUR and an aktueller Preis of 19.69 EUR for the Ultralight Bottle 500 ml.
Within insulated stainless steel bottles, the Ultralight Bottle 500 ml competes with many 16 fl oz class bottles that often weigh more than 250 g and offer similar or slightly shorter insulation times. Here the documented 202 g weight and 10 h hot / 20 h cold retention give the Ultralight a profile aimed at users who value lower carry weight without stepping down from full stainless steel construction. In outdoor coverage, the 500 ml Ultralight is highlighted as weighing about 215 g while still offering the familiar Thermos insulation performance, which compares favorably to heavier flasks in the same capacity. An outdoor gear article notes that the 500 ml Ultralight bottle at around 215 g is among the lighter stainless steel insulated bottles with comparable insulation performance.
Use Cases, Strengths And Limits
In practical use, the Thermos Ultralight Bottle 500 ml is positioned for commuters, students and outdoor users who want a steel insulated bottle that is significantly lighter than many classic vacuum flasks. The 0.5 liter volume matches a moderate coffee or tea portion or a reasonable amount of water for shorter outings, while the slim footprint and Safe Flow Lid cater to one handed drinking and leak protection in backpacks or bags. A product-focused article characterizes the Ultralight Bottle 0.5 l moon rock mat as particularly light at around 202 g and emphasizes its suitability for everyday coffee, tea or water in commuter and outdoor contexts. The dishwasher safe design cited in multiple product descriptions further supports easy cleaning, which matters for daily use where bottles are refilled frequently. A product page for the 4035.232.050 Ultralight Thermos Flask 500 ml explicitly calls the bottle dishwasher safe and lightweight.
Limits show up mainly in absolute capacity and the focus on personal use. At 500 ml, the Ultralight Bottle is sized for a single user rather than group serving, and for long day hikes or high fluid intake days many users will carry additional bottles or hydration systems. The insulation hours, while solid for the class, still depend on how hot or cold the contents are at filling and how often the lid is opened, which is standard behavior for vacuum bottles. Compared with heavier multi wall flasks that sometimes exceed 300 g for 0.5 liter capacities, the Ultralight design trades some armor like heft for lower weight, which suits users prioritizing pack light strategies but may be less appealing for those who equate higher mass with perceived ruggedness.
Key Facts: Thermos Ultralight Bottle 500 ml
- Product: Thermos Ultralight Bottle 500 ml, moon rock mat stainless steel insulated flask
- Manufacturer: Alfi GmbH, plus Thermos brand ownership
- Category: Stainless steel insulated drink bottle 0.5 liter
- Capacity: 500 ml nominal volume per bottle
- Insulation performance: Up to 10 h hot retention and 20 h cold retention for the 0.5 liter size
- Dimensions: Height 22.1 cm, bottle diameter 7.5 cm, opening diameter 4 cm
- Weight: Approximately 202 g for the 500 ml moon rock mat Ultralight Bottle
- Price: 27.95 EUR UVP with promotional prices around 19.69-21.77 EUR for the 500 ml bottle (as of 09/21/2026)
- Target audience: Commuters, students and outdoor users seeking a lightweight stainless steel insulated bottle around 0.5 liter
